[mirror_ubuntu-focal-kernel.git] / arch / s390 / include / asm / pci_io.h

#ifndef _ASM_S390_PCI_IO_H
#define _ASM_S390_PCI_IO_H

#ifdef CONFIG_PCI

#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/pci_insn.h>

/* I/O Map */
#define ZPCI_IOMAP_MAX_ENTRIES		0x7fff
#define ZPCI_IOMAP_ADDR_BASE		0x8000000000000000ULL
#define ZPCI_IOMAP_ADDR_IDX_MASK	0x7fff000000000000ULL
#define ZPCI_IOMAP_ADDR_OFF_MASK	0x0000ffffffffffffULL

struct zpci_iomap_entry {
	u32 fh;
	u8 bar;
};

extern struct zpci_iomap_entry *zpci_iomap_start;

#define ZPCI_IDX(addr)								\
	(((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> 48)
#define ZPCI_OFFSET(addr)							\
	((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)

#define ZPCI_CREATE_REQ(handle, space, len)					\
	((u64) handle << 32 | space << 16 | len)

#define zpci_read(LENGTH, RETTYPE)						\
static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr)	\
{										\
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];	\
	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH);		\
	u64 data;								\
	int rc;									\
										\
	rc = s390pci_load(&data, req, ZPCI_OFFSET(addr));			\
	if (rc)									\
		data = -1ULL;							\
	return (RETTYPE) data;							\
}

#define zpci_write(LENGTH, VALTYPE)						\
static inline void zpci_write_##VALTYPE(VALTYPE val,				\
					const volatile void __iomem *addr)	\
{										\
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];	\
	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH);		\
	u64 data = (VALTYPE) val;						\
										\
	s390pci_store(data, req, ZPCI_OFFSET(addr));				\
}

zpci_read(8, u64)
zpci_read(4, u32)
zpci_read(2, u16)
zpci_read(1, u8)
zpci_write(8, u64)
zpci_write(4, u32)
zpci_write(2, u16)
zpci_write(1, u8)

static inline int zpci_write_single(u64 req, const u64 *data, u64 offset, u8 len)
{
	u64 val;

	switch (len) {
	case 1:
		val = (u64) *((u8 *) data);
		break;
	case 2:
		val = (u64) *((u16 *) data);
		break;
	case 4:
		val = (u64) *((u32 *) data);
		break;
	case 8:
		val = (u64) *((u64 *) data);
		break;
	default:
		val = 0;		/* let FW report error */
		break;
	}
	return s390pci_store(val, req, offset);
}

static inline int zpci_read_single(u64 req, u64 *dst, u64 offset, u8 len)
{
	u64 data;
	int cc;

	cc = s390pci_load(&data, req, offset);
	if (cc)
		goto out;

	switch (len) {
	case 1:
		*((u8 *) dst) = (u8) data;
		break;
	case 2:
		*((u16 *) dst) = (u16) data;
		break;
	case 4:
		*((u32 *) dst) = (u32) data;
		break;
	case 8:
		*((u64 *) dst) = (u64) data;
		break;
	}
out:
	return cc;
}

static inline int zpci_write_block(u64 req, const u64 *data, u64 offset)
{
	return s390pci_store_block(data, req, offset);
}

static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
{
	int count = len > max ? max : len, size = 1;

	while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
		dst = dst >> 1;
		src = src >> 1;
		size = size << 1;
	}
	return size;
}

static inline int zpci_memcpy_fromio(void *dst,
				     const volatile void __iomem *src,
				     unsigned long n)
{
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(src)];
	u64 req, offset = ZPCI_OFFSET(src);
	int size, rc = 0;

	while (n > 0) {
		size = zpci_get_max_write_size((u64) src, (u64) dst, n, 8);
		req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
		rc = zpci_read_single(req, dst, offset, size);
		if (rc)
			break;
		offset += size;
		dst += size;
		n -= size;
	}
	return rc;
}

static inline int zpci_memcpy_toio(volatile void __iomem *dst,
				   const void *src, unsigned long n)
{
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
	u64 req, offset = ZPCI_OFFSET(dst);
	int size, rc = 0;

	if (!src)
		return -EINVAL;

	while (n > 0) {
		size = zpci_get_max_write_size((u64) dst, (u64) src, n, 128);
		req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);

		if (size > 8) /* main path */
			rc = zpci_write_block(req, src, offset);
		else
			rc = zpci_write_single(req, src, offset, size);
		if (rc)
			break;
		offset += size;
		src += size;
		n -= size;
	}
	return rc;
}

static inline int zpci_memset_io(volatile void __iomem *dst,
				 unsigned char val, size_t count)
{
	u8 *src = kmalloc(count, GFP_KERNEL);
	int rc;

	if (src == NULL)
		return -ENOMEM;
	memset(src, val, count);

	rc = zpci_memcpy_toio(dst, src, count);
	kfree(src);
	return rc;
}

#endif /* CONFIG_PCI */

#endif /* _ASM_S390_PCI_IO_H */
Commit	Line	Data
cd248341 JG	1	#ifndef _ASM_S390_PCI_IO_H
	2	#define _ASM_S390_PCI_IO_H
	3
	4	#ifdef CONFIG_PCI
	5
	6	#include <linux/kernel.h>
	7	#include <linux/slab.h>
	8	#include <asm/pci_insn.h>
	9
	10	/* I/O Map */
	11	#define ZPCI_IOMAP_MAX_ENTRIES 0x7fff
	12	#define ZPCI_IOMAP_ADDR_BASE 0x8000000000000000ULL
	13	#define ZPCI_IOMAP_ADDR_IDX_MASK 0x7fff000000000000ULL
	14	#define ZPCI_IOMAP_ADDR_OFF_MASK 0x0000ffffffffffffULL
	15
	16	struct zpci_iomap_entry {
	17	u32 fh;
	18	u8 bar;
	19	};
	20
	21	extern struct zpci_iomap_entry *zpci_iomap_start;
	22
	23	#define ZPCI_IDX(addr) \
	24	(((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> 48)
	25	#define ZPCI_OFFSET(addr) \
	26	((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)
	27
	28	#define ZPCI_CREATE_REQ(handle, space, len) \
	29	((u64) handle << 32 \| space << 16 \| len)
	30
	31	#define zpci_read(LENGTH, RETTYPE) \
	32	static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr) \
	33	{ \
	34	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
	35	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
	36	u64 data; \
	37	int rc; \
	38	\
b2a9e87d	39	rc = s390pci_load(&data, req, ZPCI_OFFSET(addr)); \
cd248341 JG	40	if (rc) \
	41	data = -1ULL; \
	42	return (RETTYPE) data; \
	43	}
	44
	45	#define zpci_write(LENGTH, VALTYPE) \
	46	static inline void zpci_write_##VALTYPE(VALTYPE val, \
	47	const volatile void __iomem *addr) \
	48	{ \
	49	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
	50	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
	51	u64 data = (VALTYPE) val; \
	52	\
b2a9e87d	53	s390pci_store(data, req, ZPCI_OFFSET(addr)); \
cd248341 JG	54	}
	55
	56	zpci_read(8, u64)
	57	zpci_read(4, u32)
	58	zpci_read(2, u16)
	59	zpci_read(1, u8)
	60	zpci_write(8, u64)
	61	zpci_write(4, u32)
	62	zpci_write(2, u16)
	63	zpci_write(1, u8)
	64
	65	static inline int zpci_write_single(u64 req, const u64 *data, u64 offset, u8 len)
	66	{
	67	u64 val;
	68
	69	switch (len) {
	70	case 1:
	71	val = (u64) ((u8 ) data);
	72	break;
	73	case 2:
	74	val = (u64) ((u16 ) data);
	75	break;
	76	case 4:
	77	val = (u64) ((u32 ) data);
	78	break;
	79	case 8:
	80	val = (u64) ((u64 ) data);
	81	break;
	82	default:
	83	val = 0; /* let FW report error */
	84	break;
	85	}
b2a9e87d	86	return s390pci_store(val, req, offset);
cd248341 JG	87	}
	88
	89	static inline int zpci_read_single(u64 req, u64 *dst, u64 offset, u8 len)
	90	{
	91	u64 data;
f0bacb7f	92	int cc;
cd248341	93
b2a9e87d	94	cc = s390pci_load(&data, req, offset);
b170bad4 SO	95	if (cc)
	96	goto out;
	97
cd248341 JG	98	switch (len) {
	99	case 1:
	100	((u8 ) dst) = (u8) data;
	101	break;
	102	case 2:
	103	((u16 ) dst) = (u16) data;
	104	break;
	105	case 4:
	106	((u32 ) dst) = (u32) data;
	107	break;
	108	case 8:
	109	((u64 ) dst) = (u64) data;
	110	break;
	111	}
b170bad4	112	out:
cd248341 JG	113	return cc;
	114	}
	115
	116	static inline int zpci_write_block(u64 req, const u64 *data, u64 offset)
	117	{
b2a9e87d	118	return s390pci_store_block(data, req, offset);
cd248341 JG	119	}
	120
	121	static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
	122	{
	123	int count = len > max ? max : len, size = 1;
	124
	125	while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
	126	dst = dst >> 1;
	127	src = src >> 1;
	128	size = size << 1;
	129	}
	130	return size;
	131	}
	132
	133	static inline int zpci_memcpy_fromio(void *dst,
	134	const volatile void __iomem *src,
	135	unsigned long n)
	136	{
	137	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(src)];
	138	u64 req, offset = ZPCI_OFFSET(src);
	139	int size, rc = 0;
	140
	141	while (n > 0) {
	142	size = zpci_get_max_write_size((u64) src, (u64) dst, n, 8);
	143	req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
	144	rc = zpci_read_single(req, dst, offset, size);
	145	if (rc)
	146	break;
	147	offset += size;
	148	dst += size;
	149	n -= size;
	150	}
	151	return rc;
	152	}
	153
	154	static inline int zpci_memcpy_toio(volatile void __iomem *dst,
	155	const void *src, unsigned long n)
	156	{
	157	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
	158	u64 req, offset = ZPCI_OFFSET(dst);
	159	int size, rc = 0;
	160
	161	if (!src)
	162	return -EINVAL;
	163
	164	while (n > 0) {
	165	size = zpci_get_max_write_size((u64) dst, (u64) src, n, 128);
	166	req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
	167
	168	if (size > 8) /* main path */
	169	rc = zpci_write_block(req, src, offset);
	170	else
	171	rc = zpci_write_single(req, src, offset, size);
	172	if (rc)
	173	break;
	174	offset += size;
	175	src += size;
	176	n -= size;
	177	}
	178	return rc;
	179	}
	180
	181	static inline int zpci_memset_io(volatile void __iomem *dst,
	182	unsigned char val, size_t count)
183	{
184	u8 *src = kmalloc(count, GFP_KERNEL);
185	int rc;
186
187	if (src == NULL)
188	return -ENOMEM;
189	memset(src, val, count);
190
191	rc = zpci_memcpy_toio(dst, src, count);
192	kfree(src);
193	return rc;
194	}
195
196	#endif /* CONFIG_PCI */
197
198	#endif /* _ASM_S390_PCI_IO_H */